After running the Configuration Wizard, the following error shows up that prevents the Web Console to display:
Web Request for Orion/Login.aspx failed - The remove server returned an error: (503) Server Unavailable
To help identify the issue, view the Windows Event Viewer. Under Windows Logs and Application you can filter the source as IIS-W3SVC-WP.
All Orion versions
Check Microsoft Event Manager that shows error and see the drive and folder location that need permission. The path seen in the screen shot is a virtual directory from inetpub. For this instance, the following permission was added to the SolarWinds inetpub folder, which by default is: C:\inetpub\SolarWinds
Add (Full Control)